A new paper by Andrew Berg and Jonathan Ostry (along with Haris Tsangarides) adds to the growing stock on IMF work on inequality.
In the recent past, the IMF has released papers on the impacts of fiscal tightening on inequality — see a summary here and to the research on which it is based here and here.
The IMF has also looked at the impact of capital account liberalization on inequality — see this article and Vox post.
The Berg-Ostry paper showed that inequality lowers the duration of growth spells. The new paper makes the case that redistribution efforts to lower inequality are not harmful to growth.